package com.xwd.filter;

import javax.servlet.*;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class LoginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        String url = request.getRequestURI();
        if(
                (url.endsWith("head.jsp")
                ||url.endsWith("index.jsp")
                ||url.endsWith("left.jsp")
                ||url.endsWith("head.jsp")
                ||url.endsWith("head.jsp")
                ||url.endsWith("right.jsp")
                ||url.contains("/Educational/student"))
                &&request.getSession().getAttribute("user")==null){
            response.sendRedirect("/login.jsp");
        }
        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void destroy() {

    }
}
